I had used the AlwaysUnderline, with no effect, it does work with the the HoverUnderline. A minor effect I noticed here is that once you click on a link cell (which is underlined since you are over it) the underline doesn’t show again on that cell till you click in another row.
Yep. The theme definition for the link column wasn’t checked in. Will be in the next update.
If you use linkColumn1.LinkBehavior = LinkBehavior.AlwaysUnderline or LinkBehavior.HoverUnderline it should show the underlined link.
When you click it, you still get the CellClick event, it’s not a real link, it’s a cell renderer.